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Artículos de revistas sobre el tema "Heat flux map"

Autor: Grafiati
Publicado: 4 de junio de 2021
Última modificación: 17 de febrero de 2022

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1

Kandlikar, S. G. "Development of a Flow Boiling Map for Subcooled and Saturated Flow Boiling of Different Fluids Inside Circular Tubes." Journal of Heat Transfer 113, no. 1 (1991): 190–200. http://dx.doi.org/10.1115/1.2910524.

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The thermal behavior of a flow boiling system is represented by a flow boiling map to illustrate visually the relationships among various system parameters. An earlier flow boiling map by Collier (1981) does not include the effect of mass flux and is specific to water at low pressures. For other fluids, significant departures from the parametric trends displayed in Collier’s map have been reported in the literature (e.g., Kandlikar, 1988b). In the present paper, a new flow boiling map is developed to depict the relationships among the heat transfer coefficient, quality, heat flux, and mass flu
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2

Bennett, William B., Jingfeng Wang, and Rafael L. Bras. "Estimation of Global Ground Heat Flux." Journal of Hydrometeorology 9, no. 4 (2008): 744–59. http://dx.doi.org/10.1175/2008jhm940.1.

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Abstract This study investigates the use of a previously published algorithm for estimating ground heat flux (GHF) at the global scale. The method is based on an analytical solution of the diffusion equation for heat transfer in a soil layer and has been shown to be effective at the point scale. The algorithm has several advantageous properties: 1) it only needs a single-level input of surface (skin) temperature, 2) the time-mean GHF can be derived directly from time-mean skin temperature, 3) it has reduced sensitivity to the variability in soil thermal properties and moisture, 4) it does not
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3

Greve, Ralf. "Relation of measured basal temperatures and the spatial distribution of the geothermal heat flux for the Greenland ice sheet." Annals of Glaciology 42 (2005): 424–32. http://dx.doi.org/10.3189/172756405781812510.

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AbstractThe thermomechanical, three-dimensional ice-sheet model SICOPOLIS is applied to the Greenland ice sheet. Simulations over two glacial–interglacial cycles are carried out, driven by a climatic forcing interpolated between present conditions and Last Glacial Maximum anomalies. Based on the global heat-flow representation by Pollack and others (1993), we attempt to constrain the spatial pattern of the geothermal heat flux by comparing simulation results to direct measurements of basal temperatures at the GRIP, NorthGRIP, Camp Century and Dye 3 ice-core locations. The obtained heat-flux ma
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4

Chang, J. Y., S. M. You, and A. Haji-Sheikh. "Film Boiling Incipience at the Departure From Natural Convection on Flat, Smooth Surfaces." Journal of Heat Transfer 120, no. 2 (1998): 402–9. http://dx.doi.org/10.1115/1.2824264.

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The present research is an experimental study of pool boiling nucleation behavior using flat, smooth surfaces immersed in saturated highly wetting liquids, FC-72 and FC-87. A flush-mounted, copper surface of 10 mm × 10 mm is used as a heat transfer surface, simulating a microelectronic chip surface. At the nucleation incipient points of higher wall superheats with steady increase of heat flux, vapor film blankets the smooth surface and remains on the surface. To predict this film boiling incipience phenomenon from the smooth surface, an incipience map is developed over the boiling curve. When
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5

Punjabi, Alkes, Arun Verma, and Allen Boozer. "The simple map for a single-null divertor tokamak." Journal of Plasma Physics 56, no. 3 (1996): 569–603. http://dx.doi.org/10.1017/s0022377800019474.

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We present the simple map for a single-null divertor tokamak. The simple map is an area-preserving map based on the idea that magnetic field lines are a single-degree- of-freedom time-dependent Hamiltonian system, and that the basic features of such systems near the X-point are generic. We obtain the properties of this map and the resulting footprints of field lines on the divertor plate. These include the width of the stochastic layer, the edge safety factor, the area of the footprint and the amount of magnetic flux diverted. We give the safety factor profile, the average and median values of
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6

Kapoor, Surya Prakash, and Aastha Kapoor. "Amalgamation of Terrestrial Heat Flux Map and Sedimentary Basins Map will Reduce the Risk of Exploration of Hydrocarbons." Universal Journal of Geoscience 4, no. 1 (2016): 1–7. http://dx.doi.org/10.13189/ujg.2016.040101.

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7

Lee, Ji-Hee, and Dong-Hyun Kim. "Developing Heat Flux Evaluation and Fire Risk Map for Forest Fires in Yangdong Villages." Journal of Korean Society of Hazard Mitigation 14, no. 5 (2014): 19–25. http://dx.doi.org/10.9798/kosham.2014.14.5.19.

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8

Overduin, P. P., T. Schneider von Deimling, F. Miesner, et al. "Submarine Permafrost Map in the Arctic Modeled Using 1‐D Transient Heat Flux (SuPerMAP)." Journal of Geophysical Research: Oceans 124, no. 6 (2019): 3490–507. http://dx.doi.org/10.1029/2018jc014675.

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9

Kattan, N., J. R. Thome, and D. Favrat. "Flow Boiling in Horizontal Tubes: Part 1—Development of a Diabatic Two-Phase Flow Pattern Map." Journal of Heat Transfer 120, no. 1 (1998): 140–47. http://dx.doi.org/10.1115/1.2830037.

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An improved two-phase flow pattern map is proposed for evaporation in horizontal tubes. The new map was developed based on flow pattern data for five different refrigerants covering a wide range of mass velocities and vapor qualities. The new map is valid for both adiabatic and diabatic (evaporating) flows and accurately identifies about 96 percent of the 702 data points. In addition, the new flow pattern map includes the prediction of the onset of dryout at the top of the tube during evaporation inside horizontal tubes as a function of heat flux and flow parameters.
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10

Kwon, You Jin, Dong Kun Lee, and You Ha Kwon. "Is Sensible Heat Flux Useful for the Assessment of Thermal Vulnerability in Seoul (Korea)?" International Journal of Environmental Research and Public Health 17, no. 3 (2020): 963. http://dx.doi.org/10.3390/ijerph17030963.

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Climate change has led to increases in global temperatures, raising concerns regarding the threat of lethal heat waves and deterioration of the thermal environment. In the present study, we adopted two methods for spatial modelling of the thermal environment based on sensible heat and temperature. A vulnerability map reflecting daytime temperature was derived to plot thermal vulnerability based on sensible heat and climate change exposure factors. The correlation (0.73) between spatial distribution of sensible heat vulnerability and mortality rate was significantly greater than that (0.30) bet
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11

Takherist, D., and A. Lesquer. "Mise en évidence d'importantes variations régionales du flux de chaleur en Algérie." Canadian Journal of Earth Sciences 26, no. 4 (1989): 615–26. http://dx.doi.org/10.1139/e89-053.

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Evaluation of heat flow in 230 oil wells, using temperature measurements (bottom-hole temperature and temperature of fluids in drill stem test) and various rock-porosity data, reveals a high heat-flow average (82 ± 19 mW∙m−2) associated with the Algerian Sahara basins.The isopleth map exhibits significant regional variations overprinted by short-wavelength anomalies that, in general, are related to the local geological structure.On a regional scale, we observe an essentially north–south zonation that is not directly related to the major structural units, except for the northern alpine domain.
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12

Nie, Tao, and Wei Qiang Liu. "Numerical Study on Coupled Heat Transfer of Thrust Chamber with Raised Structure." Advanced Materials Research 516-517 (May 2012): 107–10. http://dx.doi.org/10.4028/www.scientific.net/amr.516-517.107.

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By the use of the map of the thermal resistance among volume cells, we establish a coupled heat transfer model of the hot gas, chamber wall and coolant. A reduced one-dimensional model was employed for the coolant flow and heat transfer, and three dimensional heat transfer model was used to calculate the coupling heat transfer through the wall, considering heat transfer at circumferential direction, axial direction and radial direction. Based on the study the mechanism of the cooling structure heat transfer, the computing model was employed and achieved the rule of heat flux and temperature of
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13

Ghajar, Afshin J., and Lap-Mou Tam. "Flow regime map for a horizontal pipe with uniform wall heat flux and three inlet configurations." Experimental Thermal and Fluid Science 10, no. 3 (1995): 287–97. http://dx.doi.org/10.1016/0894-1777(94)00107-j.

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14

Lee and Kim. "Thermomagnetic Convection of Ferrofluid in an Enclosure Channel with an Internal Magnetic Field." Micromachines 10, no. 9 (2019): 553. http://dx.doi.org/10.3390/mi10090553.

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Ferrofluid is a colloidal liquid in which magnetic nanoparticles such as Fe3O4 are dispersed in a nonconductive solution, and the average diameter of the nanoparticles is 10 nm. When a magnetic field is applied, the ferrofluid generates magnetization, which changes the physical properties of the fluid itself. In this study, characteristics of the thermomagnetic convection of ferrofluid (Fe3O4) by the permanent magnet in the enclosure channel were studied. To effectively mix the ferrofluid (Fe3O4) and disturb the boundary layer, the heat dissipation of the heat source depending on the strength
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15

Emile-Geay, J., and G. Madec. "Geothermal heating, diapycnal mixing and the abyssal circulation." Ocean Science 5, no. 2 (2009): 203–17. http://dx.doi.org/10.5194/os-5-203-2009.

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Abstract. The dynamical role of geothermal heating in abyssal circulation is reconsidered using three independent arguments. First, we show that a uniform geothermal heat flux close to the observed average (86.4 mW m−2) supplies as much heat to near-bottom water as a diapycnal mixing rate of ~10−4 m2 s−1 – the canonical value thought to be responsible for the magnitude of the present-day abyssal circulation. This parity raises the possibility that geothermal heating could have a dynamical impact of the same order. Second, we estimate the magnitude of geothermally-induced circulation with the d
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16

Wambsganss, M. W., D. M. France, J. A. Jendrzejczyk, and T. N. Tran. "Boiling Heat Transfer in a Horizontal Small-Diameter Tube." Journal of Heat Transfer 115, no. 4 (1993): 963–72. http://dx.doi.org/10.1115/1.2911393.

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Results of a study on boiling heat transfer of refrigerant R-113 in a small-diameter (2.92 mm) tube are reported. Local heat transfer coefficients are measured for a range of heat flux (8.8–90.75 kW/m2), mass flux (50–300 kg/m2s), and equilibrium mass quality (0–0.9). The measured coefficients are used to evaluate 10 different heat transfer correlations, some of which have been developed specifically for refrigerants. High heat fluxes and low mass fluxes are inherent in small channels, and this combination results in high boiling numbers. In addition, based on a flow pattern map developed from
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17

Geli, Hatim M. E., Christopher M. U. Neale, Doyle Watts, et al. "Scintillometer-Based Estimates of Sensible Heat Flux Using Lidar-Derived Surface Roughness." Journal of Hydrometeorology 13, no. 4 (2012): 1317–31. http://dx.doi.org/10.1175/jhm-d-11-085.1.

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Abstract The estimation of sensible heat flux, H, using large aperture scintillometer (LAS) under varying surface heterogeneity conditions was investigated. Surface roughness features characterized by variable topography and vegetation height were represented using data derived from the highly accurate light detection and range (lidar) techniques as well as from traditional vegetation survey and topographic map methods. The study was conducted at the Cibola National Wildlife Refuge, Southern California, over a riparian zone covered with natural vegetation dominated by tamarisk trees interspers
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18

van der Kwast, J., W. Timmermans, A. Gieske, et al. "Evaluation of the Surface Energy Balance System (SEBS) applied to ASTER imagery with flux-measurements at the SPARC 2004 site (Barrax, Spain)." Hydrology and Earth System Sciences 13, no. 7 (2009): 1337–47. http://dx.doi.org/10.5194/hess-13-1337-2009.

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Abstract. Accurate quantification of the amount and spatial variation of evapotranspiration is important in a wide range of disciplines. Remote sensing based surface energy balance models have been developed to estimate turbulent surface energy fluxes at different scales. The objective of this study is to evaluate the Surface Energy Balance System (SEBS) model on a landscape scale, using tower-based flux measurements at different land cover units during an overpass of the ASTER sensor over the SPARC 2004 experimental site in Barrax (Spain). A sensitivity analysis has been performed in order to
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19

Yin, Zhixiang, Xiaodong Li, Yong Ge, et al. "Estimating subpixel turbulent heat flux over leads from MODIS thermal infrared imagery with deep learning." Cryosphere 15, no. 6 (2021): 2835–56. http://dx.doi.org/10.5194/tc-15-2835-2021.

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Abstract. The turbulent heat flux (THF) over leads is an important parameter for climate change monitoring in the Arctic region. THF over leads is often calculated from satellite-derived ice surface temperature (IST) products, in which mixed pixels containing both ice and open water along lead boundaries reduce the accuracy of calculated THF. To address this problem, this paper proposes a deep residual convolutional neural network (CNN)-based framework to estimate THF over leads at the subpixel scale (DeepSTHF) based on remotely sensed images. The proposed DeepSTHF provides an IST image and th
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20

Mewes, Daniel, and Christoph Jacobi. "Horizontal Temperature Fluxes in the Arctic in CMIP5 Model Results Analyzed with Self-Organizing Maps." Atmosphere 11, no. 3 (2020): 251. http://dx.doi.org/10.3390/atmos11030251.

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The meridional temperature gradient between mid and high latitudes decreases by Arctic amplification. Following this decrease, the circulation in the mid latitudes may change and, therefore, the meridional flux of heat and moisture increases. This might increase the Arctic temperatures even further. A proxy for the vertically integrated atmospheric horizontal energy flux was analyzed using the self-organizing-map (SOM) method. Climate Model Intercomparison Project Phase 5 (CMIP5) model data of the historical and Representative Concentration Pathway 8.5 (RCP8.5) experiments were analyzed to ext
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21

Zhu, Hongyu, Noemi Petra, Georg Stadler, Tobin Isaac, Thomas J. R. Hughes, and Omar Ghattas. "Inversion of geothermal heat flux in a thermomechanically coupled nonlinear Stokes ice sheet model." Cryosphere 10, no. 4 (2016): 1477–94. http://dx.doi.org/10.5194/tc-10-1477-2016.

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Abstract. We address the inverse problem of inferring the basal geothermal heat flux from surface velocity observations using a steady-state thermomechanically coupled nonlinear Stokes ice flow model. This is a challenging inverse problem since the map from basal heat flux to surface velocity observables is indirect: the heat flux is a boundary condition for the thermal advection–diffusion equation, which couples to the nonlinear Stokes ice flow equations; together they determine the surface ice flow velocity. This multiphysics inverse problem is formulated as a nonlinear least-squares optimiz
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22

Mandrusiak, G. D., V. P. Carey, and X. Xu. "An Experimental Study of Convective Boiling in a Partially Heated Horizontal Channel With Offset Strip Fins." Journal of Heat Transfer 110, no. 1 (1988): 229–36. http://dx.doi.org/10.1115/1.3250456.

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Measured local heat transfer data and visually observed two-phase flow behavior are reported for convective boiling of methanol and water in a partially heated horizontal channel with offset strip fins. In this study, a special test section was used that permitted direct visual observation of the two-phase flow while simultaneously measuring the convective boiling heat transfer coefficient at several locations along the channel. One wall of the channel was heated while the opposite and lateral walls were adiabatic. Measured local heat transfer coefficients on the heated portion of the channel
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23

Metzler-Wilson, Kristen, Kumika Toma, Dawn L. Sammons, et al. "Augmented supraorbital skin sympathetic nerve activity responses to symptom trigger events in rosacea patients." Journal of Neurophysiology 114, no. 3 (2015): 1530–37. http://dx.doi.org/10.1152/jn.00458.2015.

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Facial flushing in rosacea is often induced by trigger events. However, trigger causation mechanisms are currently unclear. This study tested the central hypothesis that rosacea causes sympathetic and axon reflex-mediated alterations resulting in trigger-induced symptomatology. Twenty rosacea patients and age/sex-matched controls participated in one or a combination of symptom triggering stressors. In protocol 1, forehead skin sympathetic nerve activity (SSNA; supraorbital microneurography) was measured during sympathoexcitatory mental (2-min serial subtraction of novel numbers) and physical (
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24

Kurihara, K., S. Kado, H. Matsuura, et al. "Development of a Thermal Probe Method for Heat Flux and Ion Temperature Measurement in the Divertor Simulator MAP-II." Fusion Science and Technology 51, no. 2T (2007): 250–52. http://dx.doi.org/10.13182/fst07-a1365.

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25

Baughn, J. W., P. T. Ireland, T. V. Jones, and N. Saniei. "A Comparison of the Transient and Heated-Coating Methods for the Measurement of Local Heat Transfer Coefficients on a Pin Fin." Journal of Heat Transfer 111, no. 4 (1989): 877–81. http://dx.doi.org/10.1115/1.3250800.

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Measurements of the local heat transfer coefficients on a pin fin (i.e., a short cylinder in crossflow) in a duct have been made using two methods, both of which employ liquid crystals to map an isotherm on the surface. The transient method uses the liquid crystal to determine the transient response of the surface temperature to a change in the fluid temperature. The local heat transfer coefficient is determined from the surface response time and the thermal properties of the substrate. The heated-coating method uses an electrically heated coating (vacuum-deposited gold in this case) to provid
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26

Wang, Lu, Yuhu Zhang, Yunjun Yao, et al. "GBRT-Based Estimation of Terrestrial Latent Heat Flux in the Haihe River Basin from Satellite and Reanalysis Datasets." Remote Sensing 13, no. 6 (2021): 1054. http://dx.doi.org/10.3390/rs13061054.

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An accurate and spatially continuous estimation of terrestrial latent heat flux (LE) is fundamental and crucial for the rational utilization of water resources in the Haihe River Basin (HRB). However, the sparsity of flux observation sites hinders the accurate characterization of spatiotemporal LE patterns over the HRB. In this study, we estimated the daily LE across the HRB using the gradient boosting regression tree (GBRT) from global land surface satellite NDVI data, reanalysis data and eddy covariance data. Compared with the random forests (RF) and extra tree regressor (ETR) methods, the G
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27

Xu, Feinan, Weizhen Wang, Jiemin Wang, Ziwei Xu, Yuan Qi, and Yueru Wu. "Area-averaged evapotranspiration over a heterogeneous land surface: aggregation of multi-point EC flux measurements with a high-resolution land-cover map and footprint analysis." Hydrology and Earth System Sciences 21, no. 8 (2017): 4037–51. http://dx.doi.org/10.5194/hess-21-4037-2017.

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Abstract. The determination of area-averaged evapotranspiration (ET) at the satellite pixel scale/model grid scale over a heterogeneous land surface plays a significant role in developing and improving the parameterization schemes of the remote sensing based ET estimation models and general hydro-meteorological models. The Heihe Watershed Allied Telemetry Experimental Research (HiWATER) flux matrix provided a unique opportunity to build an aggregation scheme for area-averaged fluxes. On the basis of the HiWATER flux matrix dataset and high-resolution land-cover map, this study focused on estim
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28

Cristóbal, Jordi, Anupma Prakash, Martha C. Anderson, William P. Kustas, Joseph G. Alfieri, and Rudiger Gens. "Surface Energy Flux Estimation in Two Boreal Settings in Alaska Using a Thermal-Based Remote Sensing Model." Remote Sensing 12, no. 24 (2020): 4108. http://dx.doi.org/10.3390/rs12244108.

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Recent Arctic warming has led to changes in the hydrological cycle. Circum-Arctic and circumboreal ecosystems are showing evidence of “greening” and “browning” due to temperature warming leading to shrub encroachment, tree mortality and deciduousness. Increases in latent heat flux from increased evapotranspiration rates associated with deciduous-dominated ecosystems may be significant, because deciduous vegetation has extremely high-water use and water storage capacity compared to coniferous and herbaceous plant species. Thus, the impact of vegetation change in boreal ecosystems on regional su
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29

Ghoshdastidar, P. S., S. Kabelac, and A. Mohanty. "Numerical modelling of atmospheric pool boiling by the coupled map lattice method." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 218, no. 2 (2004): 195–205. http://dx.doi.org/10.1243/095440604322886946.

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In the present paper, the characteristic atmospheric saturated pool boiling curve is qualitatively reproduced for water on a temperature-controlled long and thin copper strip using the coupled map lattice (CML) method known in non-linear spatio-temporal chaos dynamics. The pool height is 0.7 mm, indicating that the boiling is of the thin-film type. The work modifies the basic theoretical model proposed by Shoji in 1998 in terms of nucleation superheat distribution and mixing. The stirring action of the bubbles is modelled by increasing the fluid thermal diffusivity by an enhancement factor. It
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30

Wei, Yanzhou, Sarah T. Gille, Matthew R. Mazloff, et al. "Optimizing Mooring Placement to Constrain Southern Ocean Air–Sea Fluxes." Journal of Atmospheric and Oceanic Technology 37, no. 8 (2020): 1365–85. http://dx.doi.org/10.1175/jtech-d-19-0203.1.

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AbstractProposals from multiple nations to deploy air–sea flux moorings in the Southern Ocean have raised the question of how to optimize the placement of these moorings in order to maximize their utility, both as contributors to the network of observations assimilated in numerical weather prediction and also as a means to study a broad range of processes driving air–sea fluxes. This study, developed as a contribution to the Southern Ocean Observing System (SOOS), proposes criteria that can be used to determine mooring siting to obtain best estimates of net air–sea heat flux (Qnet). Flux moori
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31

Liu, Fukai, Jian Lu, Oluwayemi Garuba, L. Ruby Leung, Yiyong Luo, and Xiuquan Wan. "Sensitivity of Surface Temperature to Oceanic Forcing via q-Flux Green’s Function Experiments. Part I: Linear Response Function." Journal of Climate 31, no. 9 (2018): 3625–41. http://dx.doi.org/10.1175/jcli-d-17-0462.1.

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Abstract This paper explores the use of the linear response function (LRF) to relate the mean sea surface temperature (SST) response to prescribed ocean heat convergence (q flux) forcings. Two methods for constructing the LRF based on the fluctuation–dissipation theorem (FDT) and Green’s function (GRF) are examined. A 900-yr preindustrial simulation by the Community Earth System Model coupled with a slab ocean model (CESM–SOM) is used to estimate the LRF using FDT. For GRF, 106 pairs of CESM–SOM simulations with warm and cold q-flux patches are performed. FDT is found to have some skill in est
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32

Schuurmans, J. M., F. C. van Geer, and M. F. P. Bierkens. "Remotely sensed latent heat fluxes for model error diagnosis: a case study." Hydrology and Earth System Sciences 15, no. 3 (2011): 759–69. http://dx.doi.org/10.5194/hess-15-759-2011.

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Abstract. This study shows that remotely sensed ETact is useful in hydrological modelling for the procedure of model calibration and shows it potential to update soil moisture predictions. Comparison of modeled and remotely sensed ETact together with the outcomes of our data assimilation procedure points out potential model errors, both conceptual and flux-related. Assimilation of remotely sensed ETact results in a realistic spatial adjustment of soil moisture, except for the area where the model suffers from conceptual errors (forest with deep groundwater levels). By using operational (i.e. a
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33

Wilson, Thad E., Robert Carter, Michael J. Cutler, Jian Cui, Michael L. Smith, and Craig G. Crandall. "Active recovery attenuates the fall in sweat rate but not cutaneous vascular conductance after supine exercise." Journal of Applied Physiology 96, no. 2 (2004): 668–73. http://dx.doi.org/10.1152/japplphysiol.00522.2003.

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The purpose of this study was to identify whether baroreceptor unloading was responsible for less efficient heat loss responses (i.e., skin blood flow and sweat rate) previously reported during inactive compared with active recovery after upright cycle exercise (Carter R III, Wilson TE, Watenpaugh DE, Smith ML, and Crandall CG. J Appl Physiol 93: 1918-1929, 2002). Eight healthy adults performed two 15-min bouts of supine cycle exercise followed by inactive or active (no-load pedaling) supine recovery. Core temperature (Tcore), mean skin temperature (Tsk), heart rate, mean arterial blood pressu
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34

Roisman, I. V., J. Breitenbach, and C. Tropea. "Thermal atomisation of a liquid drop after impact onto a hot substrate." Journal of Fluid Mechanics 842 (March 6, 2018): 87–101. http://dx.doi.org/10.1017/jfm.2018.123.

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This experimental study is focused on the mechanisms of thermal atomisation of a drop impacting onto a hot substrate. This phenomenon is characterised by the wetting and dewetting of the substrate, caused not by the rim dynamics, but induced by thermal effects. These thermal effects lead to the lamella evaporation, levitation and disintegration, generation of a vertical spray of fine droplets and consequently, drop breakup. A typical contact time of the drop before complete detachment is theoretically estimated. This estimation agrees very well with the experiments. It is shown that the Weber
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35

Sisó, Gonzalo, Joana Rosell-Mirmi, Álvaro Fernández, et al. "Thermal Analysis of a MEMS-Based Self-Adaptive Microfluidic Cooling Device." Micromachines 12, no. 5 (2021): 505. http://dx.doi.org/10.3390/mi12050505.

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This study presents a thermal analysis of a temperature-driven microfluidic cell through a nonlinear self-adaptive micro valve that provides the mechanisms for the system to maintain a given critical temperature in an efficient way. For the description of the dynamics of the microfluidic cell, a system of two ordinary differential equations subjected to a nonlinear boundary condition, which describes the behavior of the valve, is proposed. The solution of the model, for determined conditions, shows the strong nonlinearity between the overall thermal resistance of the device and the heat flux d
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36

Passalacqua, Olivier, Catherine Ritz, Frédéric Parrenin, Stefano Urbini, and Massimo Frezzotti. "Geothermal flux and basal melt rate in the Dome C region inferred from radar reflectivity and heat modelling." Cryosphere 11, no. 5 (2017): 2231–46. http://dx.doi.org/10.5194/tc-11-2231-2017.

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Abstract. Basal melt rate is the most important physical quantity to be evaluated when looking for an old-ice drilling site, and it depends to a great extent on the geothermal flux (GF), which is poorly known under the East Antarctic ice sheet. Given that wet bedrock has higher reflectivity than dry bedrock, the wetness of the ice–bed interface can be assessed using radar echoes from the bedrock. But, since basal conditions depend on heat transfer forced by climate but lagged by the thick ice, the basal ice may currently be frozen whereas in the past it was generally melting. For that reason,
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37

Lewis, A., G. E. Hilley, and J. L. Lewicki. "Integrated thermal infrared imaging and structure-from-motion photogrammetry to map apparent temperature and radiant hydrothermal heat flux at Mammoth Mountain, CA, USA." Journal of Volcanology and Geothermal Research 303 (September 2015): 16–24. http://dx.doi.org/10.1016/j.jvolgeores.2015.07.025.

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38

Weigel, Andreas P., Fotini K. Chow, Mathias W. Rotach, Robert L. Street, and Ming Xue. "High-Resolution Large-Eddy Simulations of Flow in a Steep Alpine Valley. Part II: Flow Structure and Heat Budgets." Journal of Applied Meteorology and Climatology 45, no. 1 (2006): 87–107. http://dx.doi.org/10.1175/jam2323.1.

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Abstract This paper analyzes the three-dimensional flow structure and the heat budget in a typical medium-sized and steep Alpine valley—the Riviera Valley in southern Switzerland. Aircraft measurements from the Mesoscale Alpine Programme (MAP)-Riviera field campaign reveal a very pronounced valley-wind system, including a strong curvature-induced secondary circulation in the southern valley entrance region. Accompanying radio soundings show that the growth of a well-mixed layer is suppressed, even under convective conditions. Our analyses are based on the MAP-Riviera measurement data and the o
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39

LeMone, Margaret A., Fei Chen, Mukul Tewari, et al. "Simulating the IHOP_2002 Fair-Weather CBL with the WRF-ARW–Noah Modeling System. Part I: Surface Fluxes and CBL Structure and Evolution along the Eastern Track." Monthly Weather Review 138, no. 3 (2010): 722–44. http://dx.doi.org/10.1175/2009mwr3003.1.

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Abstract Fair-weather data from the May–June 2002 International H2O Project (IHOP_2002) 46-km eastern flight track in southeast Kansas are compared to simulations using the advanced research version of the Weather Research and Forecasting model coupled to the Noah land surface model (LSM), to gain insight into how the surface influences convective boundary layer (CBL) fluxes and structure, and to evaluate the success of the modeling system in representing CBL structure and evolution. This offers a unique look at the capability of the model on scales the length of the flight track (46 km) and s
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40

Bigeard, Guillaume, Benoit Coudert, Jonas Chirouze, et al. "Ability of a soil–vegetation–atmosphere transfer model and a two-source energy balance model to predict evapotranspiration for several crops and climate conditions." Hydrology and Earth System Sciences 23, no. 12 (2019): 5033–58. http://dx.doi.org/10.5194/hess-23-5033-2019.

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Abstract. The heterogeneity of Agroecosystems, in terms of hydric conditions, crop types and states, and meteorological forcing, is difficult to characterize precisely at the field scale over an agricultural landscape. This study aims to perform a sensitivity study with respect to the uncertain model inputs of two classical approaches used to map the evapotranspiration of agroecosystems: (1) a surface energy balance (SEB) model, the Two-Source Energy Balance (TSEB) model, forced with thermal infrared (TIR) data as a proxy for the crop hydric conditions, and (2) a soil–vegetation–atmosphere tra
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41

He, Hailong, Miles Dyck, and Jialong Lv. "The Heat Pulse Method for Soil Physical Measurements: A Bibliometric Analysis." Applied Sciences 10, no. 18 (2020): 6171. http://dx.doi.org/10.3390/app10186171.

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Heat pulse method is a transient method that estimates soil thermal properties by characterizing the radial transport of short-duration line-source heat applied to soils. It has been widely used to measure a wide range of soil physical properties including soil thermal conductivity, thermal diffusivity, heat capacity, water content, ice content, bulk density, water flux and evaporation in laboratory and field environments. Previous studies generally focus on the scientific aspects of heat pulse method based on selected publications, and there is a lack of study investigating the heat pulse pub
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42

Qiu, Guo-Dong, Wei-Hua Cai, Shu-Lei Li, Zhi-Yong Wu, Yi-Qiang Jiang, and Yang Yao. "Numerical Simulation on Forced Convective Condensation of Steam Upward Flow in a Vertical Pipe." Advances in Mechanical Engineering 6 (January 1, 2014): 589250. http://dx.doi.org/10.1155/2014/589250.

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A transient three-dimensional volume of fluid (VOF) simulation on condensation of upward flow of wet steam inside a 12 mm i.d. vertical pipe is presented. The effect of gravity and surface tension are taken into account. A uniform wall temperature has been fixed as boundary conditions. The mass flux is 130~6400 kg m−2's−1 and the turbulence inside the vapor phase and liquid phase have been handled by Reynolds stress model (RSM). The vapor quality of fluid is 0~0.4. The numerical simulation results show that, in all the simulation conditions, the bubbly flow, slug flow, churn flow, wispy annula
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43

Tomic, Ljubisa, Dalibor Jovanovic, Radovan Karkalic, et al. "Application of pulsed flash thermography method for specific defect estimation in aluminum." Thermal Science 19, no. 5 (2015): 1845–54. http://dx.doi.org/10.2298/tsci150307080t.

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Nondestructive thermal examination can uncover the presence of defects via temperature distribution profile anomalies that are created on the surface as a result of a defect. There are many factors that affect the temperature distribution map of the surface being tested by Infrared Thermography. Internal defect properties such as thermal conductivity, heat capacity and defect depth, play an important role in the temperature behavior of the pixels or regions being analyzed. Also, it is well known that other external factors such as the convection heat transfer, variations on the surface emissiv
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44

Bulakh, Olga I., Oleg K. Kostylev, Vladimir N. Nesterov, and Eldar K. Cherdizov. "Extension of lifespan of graphite in fuel blocks of high-temperature gas-cooled reactors as the resource for ensuring design values of nuclear fuel burn-up." Nuclear Energy and Technology 5, no. 4 (2019): 289–95. http://dx.doi.org/10.3897/nucet.5.48391.

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High-temperature gas-cooled reactor (HTGR) is one of promising candidates for new generation of nuclear power reactors. This type of nuclear reactor is characterized with the following principal features: highly efficient generation of electricity (thermal efficiency of about 50%); the use of high-temperature heat in different production processes; reactor core self-protection properties; practical exclusion of reactor core meltdown in case of accidents; the possibility of implementation of various nuclear fuel cycle options; reduced radiation and thermal effects on the environment, forecasted
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45

Gill, Jasravia, Kamil Faisal, Ahmed Shaker, and Wai Yeung Yan. "Detection of waste dumping locations in landfill using multi-temporal Landsat thermal images." Waste Management & Research: The Journal for a Sustainable Circular Economy 37, no. 4 (2019): 386–93. http://dx.doi.org/10.1177/0734242x18821808.

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The disposal of solid waste in a conventional landfill is inevitably associated with potential adverse environmental impacts, resulting in the migration of landfill gas and offensive odors on the surrounding areas. In addition to the obnoxious fumes and hazardous leachate, heat generation is continuously observed within the landfill during the aerobic and anaerobic phases. Despite the negative impacts, such “heat generation” phenomenon can turn into valuable information to aid in detecting unauthorized landfill activities and tracing unrecorded dumping regions. The spatial distribution of wast
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46

PIETRYKOWSKI, Konrad, Paweł MAGRYTA, and Krzysztof SKIBA. "Finite element analysis of a composite piston for a diesel aircraft engine." Combustion Engines 179, no. 4 (2019): 107–11. http://dx.doi.org/10.19206/ce-2019-417.

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The article presents calculations of thermal and mechanical loads of the piston, consisting of two parts: steel and aluminum. The calculations were made using FEM in the Abaqus software. The piston is characterized by a split construction and was equipped with a cooling oil channel. The piston will be used in an aircraft diesel engine characterized by opposite piston movement. The presented geometry of the piston is the next of the ones being developed earlier and contains preliminary assumptions as to the size and main geometrical dimensions. The thermal boundary conditions of the simulation
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47

Plank, Colin, and Bryan Shuman. "Drought-Driven Changes in Lake Areas and Their Effects on the Surface Energy Balance of Minnesota’s Lake-Dotted Landscape." Journal of Climate 22, no. 15 (2009): 4055–65. http://dx.doi.org/10.1175/2009jcli1978.1.

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Abstract Open water within Minnesota constitutes 11 830 km2 and represents a significant proportion of the moisture available on the landscape. Because lakes absorb and store heat in the spring and summer, and release heat in the autumn and winter, they also play a significant role in surface energy budgets. Lake areas fluctuate significantly over time, and thus alter surface albedo and energy partitioning in the expanding and contracting lake margin. Observations of lake areas from the 1930s “Dust Bowl” drought were used to approximate the impact of changes in lake area and volume on surface
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48

Zappa, M., and J. Gurtz. "Simulation of soil moisture and evapotranspiration in a soil profile during the 1999 MAP-Riviera Campaign." Hydrology and Earth System Sciences 7, no. 6 (2003): 903–19. http://dx.doi.org/10.5194/hess-7-903-2003.

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Abstract. Detailed plot-scale observations of basic hydrometeorological variables represent valuable data for assessing the quality of the soil moisture module and evapotranspiration scheme in hydrological models. This study presents the validation of soil moisture and evapotranspiration (ET) simulation during the special observing period (R-SOP) of the Riviera Project (July–November 1999), a sub-project of the Mesoscale Alpine Programme (MAP). The location investigated was a sandy soil plot at the edge of a corn field. The hydrological model PREVAH was driven using three meteorological data s
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49

Suliman, R., L. Liebenberg, and J. P. Meyer. "Improved flow pattern map for accurate prediction of the heat transfer coefficients during condensation of R-134a in smooth horizontal tubes and within the low-mass flux range." International Journal of Heat and Mass Transfer 52, no. 25-26 (2009): 5701–11. http://dx.doi.org/10.1016/j.ijheatmasstransfer.2009.08.017.

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50

Hodes, Marc, Toby L. Kirk, Georgios Karamanis, and Scott MacLachlan. "Effect of thermocapillary stress on slip length for a channel textured with parallel ridges." Journal of Fluid Mechanics 814 (February 6, 2017): 301–24. http://dx.doi.org/10.1017/jfm.2017.8.

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We compute the apparent hydrodynamic slip length for (laminar and fully developed) Poiseuille flow of liquid through a heated parallel-plate channel. One side of the channel is textured with parallel (streamwise) ridges and the opposite one is smooth. On the textured side of the channel, the liquid is in the Cassie state. No-slip and constant heat flux boundary conditions are imposed at the solid–liquid interfaces along the tips of the ridges, and the menisci between ridges are considered to be flat and adiabatic. The smooth side of the channel is subjected to no-slip and adiabatic boundary co
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